Answer:
x=4
Explanation:
8+x=12
We simplify the equation to the form, which is simple to understand
8+x=12
We move all terms containing x to the left and all other terms to the right.
+1x=+12-8
We simplify left and right side of the equation.
+1x=+4
We divide both sides of the equation by 1 to get x.
x=4